I want to explore capabilities of data grid, having sub grids in mendix. Eg. i want to achieve functionality as in below screenshot, I have activity grid, with sub activity as sub grid along with collapsable feature. Data grid provides only inline editing and addition of row at top/bottom. But, how to add sub grid row and have this grid and sub grid structure. Any widget that could provide this out of the box capability?
This is not trivial to achieve with Mendix. The standard data grid definitely does not support this.
You might want to use a list view styled with css to look like a table.